Manufacture of cement products



Oct. 17, 1933. L. E. CALKINS MANUFACTURE OF CEMENT PRODUCTS Filed June27, 1930 INVENTOR 5 Ca/fiV/IS ATTORNEY Patented Oct. 17, 1933 i1,931,018

UNITED STATES PATENT OFFICE MANUFACTURE OF CEMENT PRODUCTS Lloyd E.Calkins, Joliet, 111., assignor to The Ruberoid 00., Bound Brook, N. J.,a corporation of New Jersey Application June 27, 1930. Serial No.461,280 6 Claims. (01. 25-155) This invention relates to the manufactureof will result in the production of shingles having cement products andmore particularly to the an irregular wavy surface. By usingamembrane'pl-oducioniof asbestos-cement shingles. Accord- 11 having acharacteristic texture, the texture ing to a method now commonly used,such shinof the membrane may also be impressed inthe gles are made bybuilding up layers of the wet faces of the opposed shingles.

mixture of hydraulic cement and fibres on a ro- While I prefer to employthe invention in the tary drum to form a composite sheet of desiredmanner stated, it will be obvious that similar thickness. The sheet isstripped from the drum membraneous sheets may be used on the top and andcut into shingles of the desired size and bottom of each pair ofshingles instead of placshape. The shingles are then assembled in a ingmetal plates thereon. In this case both the 5 stack with metal latesplaced on the top and ack and t e face of t e shin le wi a a bottom ofthe stack and inserted between each roughened pp succeeding shingle. Thestack is then subjected What I claim is:- to heavy pressure in 'asuitable apparatu h as I 1. A method of pressing relatively flatarticles a hydraulic press. composed of hydraulic cement and fiberswhich The object of this inv ti i t fa lit t consists in arranging thearticles facetoface with the production of the shingles and lessen thecost ib e me b a e betwee t i opp faces. of manufacture by reducing thenumber of metal a d u j tin th a ti s s a ra d t p plates required inthe pressing operation. Sure- 20 I have found that a. superior productmay be 2. A method of pressingrelatively flat articles produced bydispensing with certain m t l plates composed of hydraulic cement andfibers which and inserting'a relatively thin flexible memb consists inarranging the articles face to face between the faces of; al ernateshingles of the with a flexible membrane between their opposed. stack.Where metal plates are used throughout, faces a d m al plat s n t t p ad bottom 0! 25 the shingles-when pressed, have a, flat smooth the pairof articles, and subjecting the articles so surface, but by use of aflexible membrane bearrangedtopressuretween alternate shingle 1 am m tpr 3. A method of pressing relatively flat articles a shingle having anuneven rough surface of composed of hydraulic cement and fibers whichpleasing appearance. consists in arranging the articles in a stack with30 In the accompanying drawing, relatively thin sheets of pliablenon-metallic maigure 1 is a diagrammatic view of a, r terial of acharacter not to adhereto the cement showing a stack of shinglespositioned therein, inserted between alternate articles, and subject-Fig. 2 is a sectional view of a part of the asing e Stack so formed toPressuresembled stack, i 4. A method of pressing asbestos-cement shin-35 Fig 3 is a, face iew of one of the hingles, and gles which consistsin taking a pair of shingles Fig. Ms a sectional elevation thereof, andlaying them one above the other with a sheet According to the preferredmethod of carrying of membraneous material in between. forming 11 out myinvention, I take the asbestos-cement stack of a plurality o c pa and51111360111118 shingles 10 and lay them face to face with a relatheStack t0 P ur 40 tively thin sheet of membraneous material 11 in Amethod of ssi asbesto -c t sh between the opposed faces of the hin le hgles which consists in forming a stack composed sheet of membraneousmaterial may consist of Of shingles arranged face to face with aflexible waxed paper or any other materialthat will n t membrane betweentheir opposed faces and with adhere to the shingle. The usual steelplates 13 metal plates on t p a d bottom r ea h pair.

5 are then placed on the top and bottom of each a u jec the stack topressurepair of shingles and this procedure is repeated 6. A'method ofpressing asbestos-cement shinuntil a stack of the desired height isformed. s whi h nsists in f rmin a st mp s The stack so assembled isthen placed i a, itof shingles arranged face to face with, a sheet ofable press 14, such as a hydraulic press, and subpliable waxed paperbetween their opposed faces 50 jected to heavy pressure. and with metalplates on the top and bottom of I As the asbestos-cement composition ofwhich each pair, and subjecting the stack to pressure. the shingles isformed is not of uniform density or hardness throughout, the pressingoperation LLOYD E'. CALKINS.

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